begriffs open source - cmsis-freertos/blob - Demo/CORTEX_STM32F103

1 /*

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67 1 tab == 4 spaces!

68 */

69

70 /*

71 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.

72 */

73

74 /* Scheduler includes. */

75 #include "FreeRTOS.h"

76 #include "queue.h"

77 #include "semphr.h"

78

79 /* Library includes. */

80 #include "stm32f10x_lib.h"

81

82 /* Demo application includes. */

83 #include "serial.h"

84 /*-----------------------------------------------------------*/

85

86 /* Misc defines. */

87 #define serINVALID_QUEUE ( ( QueueHandle_t ) 0 )

88 #define serNO_BLOCK ( ( TickType_t ) 0 )

89 #define serTX_BLOCK_TIME ( 40 / portTICK_PERIOD_MS )

90

91 /*-----------------------------------------------------------*/

92

93 /* The queue used to hold received characters. */

94 static QueueHandle_t xRxedChars;

95 static QueueHandle_t xCharsForTx;

96

97 /*-----------------------------------------------------------*/

98

99 /* UART interrupt handler. */

100 void vUARTInterruptHandler( void );

101

102 /*-----------------------------------------------------------*/

103

104 /*

105 * See the serial2.h header file.

106 */

107 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )

108 {

109 xComPortHandle xReturn;

110 USART_InitTypeDef USART_InitStructure;

111 NVIC_InitTypeDef NVIC_InitStructure;

112 GPIO_InitTypeDef GPIO_InitStructure;

113

114 /* Create the queues used to hold Rx/Tx characters. */

115 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );

116 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );

117

118 /* If the queue/semaphore was created correctly then setup the serial port

119 hardware. */

120 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )

121 {

122 /* Enable USART1 clock */

123 RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE );

124

125 /* Configure USART1 Rx (PA10) as input floating */

126 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

127 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

128 GPIO_Init( GPIOA, &GPIO_InitStructure );

129

130 /* Configure USART1 Tx (PA9) as alternate function push-pull */

131 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;

132 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

133 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

134 GPIO_Init( GPIOA, &GPIO_InitStructure );

135

136 USART_InitStructure.USART_BaudRate = ulWantedBaud;

137 USART_InitStructure.USART_WordLength = USART_WordLength_8b;

138 USART_InitStructure.USART_StopBits = USART_StopBits_1;

139 USART_InitStructure.USART_Parity = USART_Parity_No ;

140 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

141 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

142 USART_InitStructure.USART_Clock = USART_Clock_Disable;

143 USART_InitStructure.USART_CPOL = USART_CPOL_Low;

144 USART_InitStructure.USART_CPHA = USART_CPHA_2Edge;

145 USART_InitStructure.USART_LastBit = USART_LastBit_Disable;

146

147 USART_Init( USART1, &USART_InitStructure );

148

149 USART_ITConfig( USART1, USART_IT_RXNE, ENABLE );

150

151 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;

152 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_KERNEL_INTERRUPT_PRIORITY;

153 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

154 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

155 NVIC_Init( &NVIC_InitStructure );

156

157 USART_Cmd( USART1, ENABLE );

158 }

159 else

160 {

161 xReturn = ( xComPortHandle ) 0;

162 }

163

164 /* This demo file only supports a single port but we have to return

165 something to comply with the standard demo header file. */

166 return xReturn;

167 }

168 /*-----------------------------------------------------------*/

169

170 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )

171 {

172 /* The port handle is not required as this driver only supports one port. */

173 ( void ) pxPort;

174

175 /* Get the next character from the buffer. Return false if no characters

176 are available, or arrive before xBlockTime expires. */

177 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )

178 {

179 return pdTRUE;

180 }

181 else

182 {

183 return pdFALSE;

184 }

185 }

186 /*-----------------------------------------------------------*/

187

188 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )

189 {

190 signed char *pxNext;

191

192 /* A couple of parameters that this port does not use. */

193 ( void ) usStringLength;

194 ( void ) pxPort;

195

196 /* NOTE: This implementation does not handle the queue being full as no

197 block time is used! */

198

199 /* The port handle is not required as this driver only supports UART1. */

200 ( void ) pxPort;

201

202 /* Send each character in the string, one at a time. */

203 pxNext = ( signed char * ) pcString;

204 while( *pxNext )

205 {

206 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );

207 pxNext++;

208 }

209 }

210 /*-----------------------------------------------------------*/

211

212 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )

213 {

214 signed portBASE_TYPE xReturn;

215

216 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) == pdPASS )

217 {

218 xReturn = pdPASS;

219 USART_ITConfig( USART1, USART_IT_TXE, ENABLE );

220 }

221 else

222 {

223 xReturn = pdFAIL;

224 }

225

226 return xReturn;

227 }

228 /*-----------------------------------------------------------*/

229

230 void vSerialClose( xComPortHandle xPort )

231 {

232 /* Not supported as not required by the demo application. */

233 }

234 /*-----------------------------------------------------------*/

235

236 void vUARTInterruptHandler( void )

237 {

238 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;

239 char cChar;

240

241 if( USART_GetITStatus( USART1, USART_IT_TXE ) == SET )

242 {

243 /* The interrupt was caused by the THR becoming empty. Are there any

244 more characters to transmit? */

245 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )

246 {

247 /* A character was retrieved from the queue so can be sent to the

248 THR now. */

249 USART_SendData( USART1, cChar );

250 }

251 else

252 {

253 USART_ITConfig( USART1, USART_IT_TXE, DISABLE );

254 }

255 }

256

257 if( USART_GetITStatus( USART1, USART_IT_RXNE ) == SET )

258 {

259 cChar = USART_ReceiveData( USART1 );

260 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );

261 }

262

263 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );

264 }

270